ML20059F628
| ML20059F628 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 08/28/1990 |
| From: | Denton R BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9009110281 | |
| Download: ML20059F628 (2) | |
Text
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t BALTIMORE I
OAS AND ELECTRIC -
~
CHARLES CENTER
- P.O. BOX 1475
- BALTIMORE, MARYLAND 21203-1475 l
)
R. E. DENTON MApsAGEh I
CAtyf RT CUFFS NUCLE AR August 28,1990 eo. a na~i waame~t U. S. Nuclear Regulatory Commission Washington,DC 20555 ATTENTION:
Document Control Desk
SUBJECT:
Calvert Cliffs Nuclear Power Plant Unit Nos.1 & 2; Docket Nos. 50-317 & 50-318 Meteorological Monitoring Instrumentation Special Report -
Technical Specification 3.3.3.4.a Gentlemen:
Per the requirements of Technical ?pecification 3.3.3.4.a we hereby submit the following Special Report concermng inoperable meteorological monitoring instrumentation channels.
i Should you have any further questions regarding this matter, we will be pleased to discuss them with you.
1 Very trulyyours, l
F W
RED /DWM/bjd Attachment ec:
D. A. Brune, Esquire J. E. Silberg, Esquire R. A. Capra, NRC I
l D. G. Mcdonald, Jr., NRC T. T. Martin, NRC L E. Nicholson, NRC R. I. McLean, DNR i
ff l$ Y 9009110201 900028 Mk PDR ADOCK 05000317 jf g
PNV
A'ITACilMENT (1)
METEOROLOGICAL MONITORING INSTRUMENTATION SPECIAL REPORT TECIINICAL SPECIFICATION 333.4.a HACKGROUND On August 11, 1990, the Meteorological Information Data Acquisition System (MIDAS), which provides meteorological information to the Control Room, was out of service due to a loss of power to the primary tower. After power was restored two days later, it was discovered that equipment inside the telephone cabinet at the primary tower had been severely damaged and the telephone cable had been severed. 'Ihe equipment in the cabinet was repaired and an alternate telephone cable route was found and connected. We will attempt to repair the original cable.
CAUSE OF MALFUNCTION The loss of power was caused by a fault in the power cable from the switchyard house to the meteorological tower. This fault appears to have been caused by moisture intrusion into an existing nick in the cable. It has not been determined whether the damage in the telephone cabinet was a result of the power cable problem or caused by a lightening strike.'The telephone cable was probably damaged by some construction work going on.ncriby. This will be verified when the original cable is examined.
PI ANS FOR RESTORING TIIE CilANNEL TO OPERAi1LE STATUS i
MIDAS was restored to operable status on August 21,1990, following a final circuit board switch alignment.
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